盐胁迫对扁桃砧木营养器官离子吸收的影响

温室条件下,用NaCl和Na2SO4处理石头扁桃、桃扁桃和毛桃,处理浓度为0,75,150,300和350 mmol/L,处理10,20 d分别取叶、根和茎,测定各器官中离子吸收与分布变化规律。研究结果表明,盐胁迫下,3种砧木根、茎、叶中Na ,Cl-,SO42-含量及Na /K 比均随盐浓度的增加和处理时间的延长而增加,K 含量变化规律不稳定,但桃扁桃根、茎和叶片中K 略高于其他两个品种;石头扁桃根、茎、叶片中Na /K 比值高于其它两个品种,桃扁桃中Na /K 比值最低。桃扁桃根部Na ,Cl-和SO42-含量高于石头扁桃和毛桃,而叶片和茎中Na ,Cl-和SO42-含量却低于石头扁桃和毛桃。桃扁桃根部能够积累较多的Na ,阻止和减少了Na 向地上部的运输,从而减轻了Na2SO4对它的伤害,进而表明了桃扁桃耐盐能力较强。

Effects of Salt Stress on Ion Uptakes by Different Organs of Almond Rootstocks

Under Greenhouse condition,Amygdalus communis L.,A.commans persicoides and A.persica were treated with NaCl and Na2SO4 at concentration of 0,75,150,300 and 350 mmol/L respectively.Measuring the contents of almond rootstocks organs all went up with increased salt stress and longer treatment days.The results showed that:Under salt stress,it was found the content of Na ,Cl-,SO2-4 and Na /K ratio in almond rootstocks organs all went up with increased salt stress and longer treatment days,K content changed irregularly.But K content in every organ of A.commans persicoides rootstocks was higher than that of other two almond rootstocks;the ratio of Na /K in Amygdalus communis L.was higher than that of other two rootstocks.The content of Na ,Cl-and SO2-4 in A.commans persicoides rootstocks was higher than that of other two rootstocks and that in A.commans persicoides leaf and stalk lower than that of other rootstocks.The A.commans persicoides's root could accumulate more Na content,held back and decreased its transfer out of soil so that keep the Na content lower in leaf and stalk,thereby decreased harm of Na2SO4.The results suggest that the A.commans persicoides has stronger salt tolerance than others.